A. I like enlighten but we also use Zoom , its a personal prefence and the wider range of uses combineed with effectiveness. The result varies from system to system & patient to patient. In general you can get similar results with a lot of systems if you have time. I prefer tray whitening when 1. the patient wants to match to existing crowns or veneers, 2. patient is worried about going too white before they have the chance to stop. 3. its often cheaper 4. it’s easier to manage tooth sensitivity I prefer power whitening such as Zoom! when 1. the patient has a deadline ( e.g. family wedding next week) 2. Patient can’t sleep with trays in 3. patient uncomfortable administering their own kit I prefer hybrid systems like “enlighten” when the patient wants the maximum result in the minimum time and is prepared to pay a little more. Hope this Helps Rob